"TOMORROW ~Shiawase no Housoku~" (TOMORROW ~しあわせの法則~; TOMORROW ~Law of Happiness~) is the second digital single of Flower, released on December 16, 2014. The song was later released physically as the second A-side of Flower's ninth single "Sayonara, Alice / TOMORROW ~Shiawase no Housoku~".
The song is a cover of "Tomorrow" from the musical Annie and was used as the theme song for the Japanese dub of the 2014 version of the movie.